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AudioPreviewThread.h

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */

/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
    Copyright 2000-2009 the Rosegarden development team.

    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _RG_AUDIOPREVIEWTHREAD_H_
#define _RG_AUDIOPREVIEWTHREAD_H_

#include "base/RealTime.h"
#include <map>
#include <qevent.h>
#include <qmutex.h>
#include <qthread.h>
#include <utility>
#include <vector>


class QObject;


namespace Rosegarden
{

class AudioFileManager;


class AudioPreviewThread : public QThread
{
public:
    AudioPreviewThread(AudioFileManager *manager);
    
    virtual void run();
    virtual void finish();
    
    struct Request {
        int audioFileId;
        RealTime audioStartTime;
        RealTime audioEndTime;
        int width;
        bool showMinima;
        QObject *notify;
    };

    virtual int requestPreview(const Request &request);
    virtual void cancelPreview(int token);
    virtual void getPreview(int token, unsigned int &channels,
                            std::vector<float> &values);

    void setEmptyQueueListener(QObject* o) { m_emptyQueueListener = o; }

    static const QEvent::Type AudioPreviewReady;
    static const QEvent::Type AudioPreviewQueueEmpty;
    

protected:
    virtual bool process();


    AudioFileManager *m_manager;
    int m_nextToken;
    bool m_exiting;

    QObject* m_emptyQueueListener;

    typedef std::pair<int, Request> RequestRec;
    typedef std::multimap<int, RequestRec> RequestQueue;
    RequestQueue m_queue;

    typedef std::pair<unsigned int, std::vector<float> > ResultsPair;
    typedef std::map<int, ResultsPair> ResultsQueue;
    ResultsQueue m_results;

    QMutex m_mutex;
};


}

#endif

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